#include "Acceptor.hpp"
#include "Logger.hpp"
#include "InetAddress.hpp"

#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <unistd.h>

static int createNonblocking()
{
    int sockfd=::socket(AF_INET,SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC,0);
    if(sockfd<0)
    {
        LOG_FATAL("%s:%s:%d listen socket create err:%d \n",__FILE__,__FUNCTION__,__LINE__,errno);
    }
    return sockfd;
}

Acceptor::Acceptor(EventLoop *loop,InetAddress &listenAddr,bool reuseport)
    : loop_(loop)
    ,acceptSocket_(createNonblocking()) //socket
    ,acceptChannel_(loop,acceptSocket_.fd())
    ,listenning_(false)
{
    acceptSocket_.setReuseAddr(true);
    acceptSocket_.setReusePort(reuseport);
    acceptSocket_.bindAddress(listenAddr); //bind
    //TcpServer::start() Acceptor.listen() 有新用户的连接，要执行一个回调 (connfd =》 channle =》 subloop)
    //baseLoop => acceptChannel_(listenfd)
    acceptChannel_.setReadCallback(std::bind(&Acceptor::handleRead,this));
}

Acceptor::~Acceptor()
{
    acceptChannel_.disableAll();
    acceptChannel_.remove();
}

void Acceptor::listen()
{
    listenning_=true;
    acceptSocket_.listen(); //listen
    acceptChannel_.enableReading(); //acceptChannel_ => Poller
}

// listenfd有事件发生了，就是有新用户连接了
void Acceptor::handleRead()
{
    InetAddress peerAddr;
    int connfd=acceptSocket_.accept(&peerAddr);
    if(connfd >= 0)
    {
        if(newConnectionCallback_)
        {
            newConnectionCallback_(connfd,peerAddr);//轮询找到subLoop,唤醒，分发当前的新客户端的Channel
        }
        else
        {
            ::close(connfd);
        }
    }
    else
    {
        LOG_ERROR("%s:%s:%d accept err:%d \n",__FILE__,__FUNCTION__,__LINE__,errno);
        if(errno == EMFILE)
        {
            LOG_ERROR("%s:%s:%d sockfd reached limit! \n",__FILE__,__FUNCTION__,__LINE__);
        }
    }
}